CyberSecBulletin
CVE-2023-32140NVD status: Analyzed

DAP-1360: Heap-based Buffer Overflow

Published Updated By the CyberSecBulletin desk

CVE-2023-32140 is a high-severity heap-based buffer overflow vulnerability in DAP-1360 from D-Link, with a CVSS 3.0 base score of 7.5 out of 10. It can be exploited from the same local network by an unauthenticated attacker, without any action from a user. Affected DAP-1360 versions: 6.14B01 EU HOTFIX; v6.14b01 and earlier. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.91% chance of exploitation within 30 days, higher than 61% of scored CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Dap-1360 Firmware to 6.15eub01 or a later version.
  2. Update Dap-2020 Firmware to 1.03rc004 or a later version.
  3. Read the advisory on supportannouncement.us.dlink.com for workarounds and exact fixed builds.

Affected products and versions

VendorProductAffected versionsFixed in
D-LinkDAP-13606.14B01 EU HOTFIX; v6.14b01 and earlierNot stated
D-LinkDap-1360 Firmwarebefore 6.15eub016.15eub01
D-LinkDap-2020 Firmwarebefore 1.03rc0041.03rc004

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
AdjacentThe attacker must be on the same local network segment.
Attack complexity
HighSuccess depends on conditions outside the attacker's control.
Privileges required
NoneNo account or login is needed.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
HighData or code can be modified at will.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by CNA (trendmicro.com).

Scoring systemScoreSeverityScored by
CVSS 3.17.5HighCISA (ADP)
CVSS 3.07.5HighCNA (trendmicro.com)

Official description

D-Link DAP-1360 webproc var:sys_Token Heap-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of D-Link DAP-1360 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling requests to the /cgi-bin/webproc endpoint. When parsing the var:sys_Token parameter, the process does not properly validate the length of user-supplied data prior to copying it to a fixed-length heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of root. . Was ZDI-CAN-18418.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Heap-based Buffer Overflow

The product writes past the end of a buffer that was allocated on the heap.

How developers prevent this class of flaw

  • Pre-design: Use a language or compiler that performs automatic bounds checking.
  • Use an abstraction library to abstract away risky APIs. Not a complete solution.
  • Use automatic buffer overflow detection mechanisms that are offered by certain compilers or compiler extensions. Examples include: the Microsoft Visual Studio /GS flag, Fedora/Red Hat FORTIFY_SOURCE GCC flag, StackGuard, and ProPolice, which provide various mechanisms including canary-based detection and range/index checking. D3-SFCV (Stack Frame Canary Validation) from D3FEND discusses canary-based detection in detail.

More Heap-based Buffer Overflow vulnerabilities (CWE-122)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
  3. Record last changed materially (score, affected products, status or references).

References

Other vulnerabilities in DAP-1360

All DAP-1360 vulnerabilities

Recent Heap-based Buffer Overflow vulnerabilities

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